Revert of Start EmbeddedWorker during registration - take 2

content/browser/service_worker/embedded_worker_registry.h

Index: content/browser/service_worker/embedded_worker_registry.h
diff --git a/content/browser/service_worker/embedded_worker_registry.h b/content/browser/service_worker/embedded_worker_registry.h
index 6645b7b46abf5387f17b3fb056daf5e796574751..02a53583fd0f0392899e02d0d826cb5957f3e7b7 100644
--- a/content/browser/service_worker/embedded_worker_registry.h
+++ b/content/browser/service_worker/embedded_worker_registry.h
@@ -6,7 +6,6 @@
 #define CONTENT_BROWSER_SERVICE_WORKER_EMBEDDED_WORKER_REGISTRY_H_
 
 #include <map>
-#include <set>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ -86,7 +85,7 @@
 
   // Map from process_id to embedded_worker_id.
   // This map only contains running workers.
-  std::map<int, std::set<int> > worker_process_map_;
+  std::map<int, int> worker_process_map_;
 
   int next_embedded_worker_id_;